MIL-HDBK-1025/10
Heating Materials. Heating materials and equipment used in splicing cable will
8.7
be heated in such manner as to prevent any hazard to the those working in manholes or vaults and
to vehicular or pedestrian traffic.
Elimination Heating Materials Hazards
8.7.1
WARNING
Observe the following precautions to protect yourself, others, and the workplace.
a. Gloves will be worn while heating or working with hot insulating compound.
b. Furnaces and tanks containing liquefied petroleum gas, such as butane or propane, will
not be placed in a manhole or vault.
cannot enter the vault or manhole in the event of spillage.
d. Torches or furnaces should be kept at a safe distance from flammable materials.
Heating Materials Work Precautions
8.7.2
WARNING
The following work rules apply to the use of torches, furnaces, pots, and
soldering devices. Only workers who are familiar with the use of torches
and furnaces will be allowed to use them.
a. Only approved soldering pots, furnaces, and ladles in good condition will be used.
b. Keep lighted furnaces or torches 1.2 meters (4 feet) or more from manhole openings
wherever practicable and where they will be the least possible hazard to property, workers, and
the public. If necessary to use torches or furnaces in manholes, adequate ventilation should be
provided to support combustion and provide sufficient air for workers.
c. Solder ladles should be heated before use. Be sure that scraps of cold solder are dry
before remelting. Moisture and molten metal should never come in contact with one another
because this will cause a splash of hot metal. Bars or pigs of solder, tools, and ladles should be
heated over the furnaces before being put into a pot of hot solder. (New workers should be
cautioned about this hazard.)
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